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AD6439

Discrete Multitone (DMT) Coprocessor


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AD6439 pdf
a
Discrete Multitone (DMT) Coprocessor
for ADSL Chipsets
AD6439
FEATURES
Component in Analog Devices’ AD20msp918 ADSL
Chipset
Designed to ANSI T1.413 Issue 2/ETSI TR238/ITU
G.992.1 and G.992.2
Higher Performance
Improved Data Rates or Longer Reach
Suitable for CO or Residence (ATU-R and ATU-C)
Performs All DMT Functions and Operations
Trellis Coding
Echo Cancellation
Symmetric Transforms (512 Point)
Flexible Allocation of Tones Upstream/Downstream
Supports Symmetric Services (SDSL)
Increased Upstream (e.g., 1 Mbps)
Supports ADSL Over ISDN (Shifted U/S)
Strict Filters for Spectral Compatibility
128-Lead MQFP
–40؇C to +85؇C, 3.3 V Operation, 1.1 W
GENERAL DESCRIPTION
The AD6439 Discrete Multitone (DMT) Coprocessor is part of
Analog Devices ADSL solution, a series of flexible, standards-
based chipsets for creating high performance ADSL and SDSL
modems that implement a superset of standard Category 2
functionality.
A high performance alternative to the AD6436 DMT Coprocessor,
the AD6439 meets the functionality requirements of ANSI
T1.413 Category 2 (trellis coding, echo cancellation), but is
considerably more versatile. It implements both transmit and
receive paths (trellis coding/decoding, IFFT/FFT, filtering and
echo cancellation). Symmetric transforms allow flexible alloca-
tion of upstream and downstream bandwidth, including sym-
metric data rates. Improved digital filters exceed the requirements
of T1.413 and deliver strict spectral masks (e.g., for VDSL
compatibility).
FUNCTIONAL BLOCK DIAGRAM
AD6435 TX SERIAL
OR
AD6436
INTERFACE
FRAMER
RX SERIAL
TRELLIS
ENCODE/
DECODE
IFFT
512/512PT
IFFT
512/512PT
DIGITAL FILTER
TX PATH
FILTERS
EC
RX PATH
FILTERS
16
DAC
AD6440
OR
AD6437
16
ADC
DSP PORT
CONTROL LOGIC
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999



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AD6439 pdf
AD6439–SPECIFICATIONS
Parameter
Transmit DAC Port—Data Width
Transmit DAC Port—Rates
Receive ADC Port—Data Width
Receive ADC Port—Rates
Downstream FFT/IFFT
Upstream FFT/IFFT
Bits/Carrier (Max)
Interface to AD6435/AD6438
Power Supply
VDD
PDISS
Temperature Range
Specifications subject to change without notice.
Value
16 Bit
17.664 MHz, 8.832 MHz, 2.208 MHz
16 Bit
8.832 MHz or 2.208 MHz
512 Points
512 Points
15
Serial 35.328 MHz
+3.0 V to +3.6 V
< 1.25 W Max at 3.6 V
–40°C to +85°C
ELECTRICAL SPECIFICATIONS
Parameter
VOH
VOL
VIH
VIL
IIH
IIL
Specifications subject to change without notice.
Typ Value
VDD – 0.4 V dc
0.4 V dc
2.0 V dc
1.0 V dc
± 500 nA
± 500 nA
TIMING SPECIFICATIONS
TX TIMING
Parameter
Description
tTX–SR
tTX-HR
tTX-SF
tTX-HF
Setup Time of TX_AEC[15:0] from Rising Edge of TX_CLK
Hold Time of TX_AEC[15:0] from Rising Edge of TX_CLK
Setup Time of TX_AEC[15:0] from Falling Edge of TX_CLK
Hold Time of TX_AEC[15:0] from Falling Edge of TX_CLK
RX TIMING
Parameter
tRX–S
tRX–H
TX_CLK
TX_AEC [15:0]
VALID DATA
VALID DATA
tTX-SR tTX-HR
tTX-SF tTX-HF
Figure 1. TX Timing
Description
Setup Time of RX[15:0] from Rising Edge of RX_CLK
Hold Time of RX[15:0] from Rising Edge of RX_CLK
RX_CLK
RX[15:0]
VALID DATA
tRX-S
tRX-H
Figure 2. RX Timing
Comments
At Either CO or RT
At Either CO or RT
256 Tones
256 Tones
Both Transmit and Receive
Comments
At IOH = –0.5 mA
VIN = VDD = 3.6 V
VIN = 0 V, VDD = 3.6 V
Typ Units
12 ns
6 ns
12 ns
6 ns
Typ Units
25 ns
0 ns
–2– REV. 0



Part Number AD6439
Description Discrete Multitone (DMT) Coprocessor
Maker Analog Devices - Analog Devices
Total Page 12 Pages
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